Addition of frequently asked questions and rearrangement of links

[Ben Bullock]

Recently a user enquired about the KanjiVG not looking like the computer typefaces again so I've begun a frequently asked questions document here:

https://kanjivg.tagaini.net/faq.html

Clicking on the "issues" and "download" would take the user away from the kanjivg website, which may have been a bit of a surprise to some people, so I've reorganised the links under the heading "Source" and added a note that they go to github.